﻿// 
//    Copyright 2010 The JaernCloud Project
// 
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
// 
//        http://www.apache.org/licenses/LICENSE-2.0
// 
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
// 
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace JaernCloud.Language.Compiler.Ast {
    
    /// <summary>
    /// If Query Operator
    /// </summary>
    public class AstIfQueryOperator : AstQueryOperator {

        public AstIfQueryOperator()
        {
            Node = new AstNode();
        }

        /// <summary>
        /// The node representing the "if" query
        /// </summary>
        public AstNode Node { get; private set; }

        /// <summary>
        /// The expression from which an enumerable collection of query results will be retrieved. Currently only persisted models support this.
        /// </summary>
        public AstTag Tag {
            get { return Node.Tag; }
        }

        /// <summary>
        /// The expression from which an enumerable collection of query results will be retrieved
        /// </summary>
        public AstExpression Expression {
            get { return Node.Expression; }
        }

        public override string ToString() {
            StringBuilder sb = new StringBuilder("foreach");
            if (Node.Children.Count > 0) {
                sb.Append('(');
            } else {
                sb.Append(' ');
            }
            if (Identifier != null)
            {
                sb.Append(Identifier).Append(" in ");
            }
            if (Node.Children.Count > 0) {
                sb.Append(Node.ToString());
                sb.Append(')');
            } else if (Expression != null) {
                sb.Append(Expression.ToString());
            } else if(Tag != null) {
                sb.Append(Tag.ToString());
            }
            return sb.ToString();
        }


    }
}
